Portion of a crib



FIG. 1 is a front perspective view of a portion of a crib showing my new design;

FIG. 2 is a front elevational view thereof with the opposite side being a mirror image; and,

FIG. 3 is a top plan view thereof.

The broken line showing of the remainder of the crib is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a crib, as shown and described. 